Grease 8 inch pan with butter.
In mixer, beat confectioners' sugar, graham cracker crumbs, peanut butter, salt and butter.
Press this evenly into the pan.
Heat cream in microwave just to a boil.
Add the chocolate and cover 1 minute.
Whisk smooth and pour over peanut butter base.
Chill 1 hour and cut into bars.
Sprinkel each with flaked salt.